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Lung and chest wall mechanics in microgravity.

J Edyvean1, M Estenne, M Paiva

  • 1Thoracic Medicine Unit, Westmead Hospital, Sydney, New South Wales, Australia.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|November 1, 1991
PubMed
Summary

Weightlessness alters respiratory mechanics, increasing abdominal contribution to breathing and decreasing functional residual capacity. Respiratory mechanics in zero gravity resemble a state between upright and supine postures at normal gravity.

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Area of Science:

  • Physiology
  • Aerospace Medicine
  • Respiratory Mechanics

Background:

  • Understanding respiratory mechanics is crucial for human adaptation to altered gravity environments.
  • Previous studies have explored respiratory responses to microgravity, but detailed analysis of abdominal and chest wall interactions is ongoing.

Purpose of the Study:

  • To investigate the effects of short-duration weightlessness on lung, chest wall, and abdominal mechanics.
  • To quantify changes in respiratory parameters during parabolic flight-induced microgravity.

Main Methods:

  • Utilized parabolic flight to induce 15-20 second periods of weightlessness.
  • Measured airflow, thoracoabdominal and compartmental volume changes, and gastric pressure (Pga).
  • Assessed esophageal pressures in a subset of subjects to estimate transdiaphragmatic pressure (Pdi).

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Main Results:

  • Functional residual capacity decreased by 244 ml due to inward abdominal displacement.
  • End-expiratory gastric pressure significantly decreased from 6.8 to 2.5 cmH2O.
  • Abdominal contribution to tidal volume increased, and abdominal compliance rose by approximately 63%.

Conclusions:

  • Respiratory mechanics in weightlessness are intermediate between upright and supine postures at 1 G.
  • During weightlessness, intra-abdominal pressure appears to be zero, the diaphragm is passively tensed, and a small pleural pressure gradient may persist.